Here's how you can master network security from scratch.

Thinking about cyber security? Here's your fast-track guide: 1. Grasp the basics with free courses and YouTube content related to network security. 2. Deep dive with books like "Firewalls and Internet Security". 3. Get hands-on with virtual labs. 4. Follow infosec leaders & attend conferences. 5. Network with infosec pros (ISACA, (ISC)2). 6. Get certified to validate your skills.

You cannot be successful at securing a network unless you understand how networks function. Know the OSI model, as well as the different protocols for each layer and how they interact with each other; understand how switches and routers transfer packets to different MAC and IP addresses. Mastering these basics is essential to learning how to secure networks.

I would recommend not rushing about things as sometimes it would be overwhelming to grasp all the concepts at the same time. Use simulation tools like packet tracer Wireshark to get better understanding of network and security concepts

Déjà il est primordial de maitriser les bases de réseau, comprendre le model OSI, les diffèrent protocoles ainsi que les ports associé, les sites comme CBTnuggets permettent d'acquérir des bases solides en network sécurité via des tutoriels bien illustrés

Start with understanding the basics of the OSI model and its layers to grasp network functioning and communication. Use high-quality educational resources, such as courses on firewalls and Internet security, and virtual labs for practical exercises. Obtain recognized certifications like CEH, ISO 27001/27005/27032, and CompTIA (A+, Network+, Security+) to validate and deepen your cybersecurity skills. Finally, develop practical skills by learning to configure IDS/IPS and work with VPNs to implement security measures and prepare for real-world cybersecurity challenges.

You might be tempted to pursue certifications, which can be useful. However, if you have no real experience working with networks, then certifications just show that you understand concepts on paper. A home lab does not need to be expensive. You likely will be able to run virtual machines and a virtual network on your laptop or computer. Practice setting up a switch, a router, a firewall, configuring an IDS/IPS, working with a VPN.

Appliquer le principe de moindre privilège, n'autoriser les flux et connexion essentielles, et nécessaires, et désactiver tout autre protocole qui ne cadre pas avec l'usage destiné. Faire la segmentation réseau, séparer les serveurs frontaux, les serveurs bd, les réseaux des imprimantes, les admin, les users et les guests

Etre abonné aux newsletters de organes de sécurité tel que l'ANSSI, le BJCSIRT etc pour être informé des nouvelles vulnérabilités critiques pouvant exposer vos SI

Certifying what you know is great for resumes. There are some through Comptia (A+, Network+, Security+) and more advanced ones as well. Certificates can be overwhelming at times when you aren't sure which one to go for. There are a lot of guides and forums out there to help you pick which one(s) are right for you. These can be used to land a better job or even show value to get a raise at a current job.

Faire suivre au staff IT des formation certifiantes tel que le CEH, les certification de la famille de ISO 27001/27005/27032 etc